Web Reference: In this program, you'll learn to reverse a number using a while loop and a for loop in Java. Jul 23, 2025 · Algorithm for Reversing a Number in Java To reverse a number, the following steps should be performed: Take the number's modulo by 10. Multiply the reverse number by 10 and add modulo value into the reverse number. Divide the number by 10. Repeat the above steps until the number becomes zero. reversed = reversed * 10 + digit; . num /= 10; } System.out.println("Reversed: " + reversed); Explanation: We start with the number 1234. Inside the loop: - num % 10 gives us the last digit (4, then 3, then 2, then 1). - We add this digit to reversed, making the new number grow step by step.
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